we use to keep embdem geese, wer really nice, strong to handle though but manageable. they ate alot of grass which was one of reasons we got them. they were popular and easy to sell the offspring if required. could be very noisy 1st thing in morning but as long as uv no headache, its ok !! we never ate them but would have now if we still had them. we only lost one to a fox, we'd tried to move them down to a much larger pond at bottom of farm but she must hav sat on bank to lay her egg and fox took her.
when they were at the pond near my house, they were totally free range, they never liked their goose house but slept in barn at night in winter and outside during summer.only sold them cos our toddler was terrified of them at the time.
culling is usually broomstick method, i would imagine, and traditionally they are killed as green geese, in late summer before grass has gone, so no hard food is fed. or fattened til just before xmas.
good luck.